Timing Advance Command for Multiple Timing Advances

Abstract

A wireless device transmits a random-access (RA) preamble for an RA procedure of a serving cell of a first timing advance group (TAG) associated with a first transmission configuration indication (TCI) state, and a second TAG associated with a second TCI state. The wireless device receives an RA response (RAR), corresponding to the RA preamble, wherein the RAR comprises a timing advance command (TAC) and a bitfield indicating a binary value. The RAR does not comprise a TAG index. The wireless device applies the TAC to a TAG that is the first TAG in response to the binary value being set to a first value, and the second TAG index in response to the binary value being set to a second value. The wireless device transmits, via the serving cell, an uplink signal based on a TA value of the TAG.

1 . A method comprising:
 transmitting, by a wireless device, a random-access (RA) preamble for an RA procedure of a serving cell of:
 a first timing advance group (TAG) associated with a first transmission configuration indication (TCI) state; and 
 a second TAG associated with a second TCI state; 
   receiving an RA response (RAR), corresponding to the RA preamble, wherein the RAR comprises:
 a timing advance command (TAC); and 
 a bitfield indicating a binary value; 
 wherein the RAR does not comprise a TAG index; 
   applying the TAC to a TAG that is:
 the first TAG in response to the binary value being set to a first value; and 
 the second TAG index in response to the binary value being set to a second value; and 
   transmitting, via the serving cell, an uplink signal based on a TA value of the TAG.   
     
     
         2 . The method of  claim 1 , further comprising receiving one or more configuration parameters indicating one of the first TAG and the second TAG to apply the TAC. 
     
     
         3 . The method of  claim 2 , wherein the one or more configuration parameters indicate:
 the first TAG being associated with the first TCI state; and   the second TAG being associated with the second TCI state.   
     
     
         4 . The method of  claim 2 , wherein the applying is further based on the one or more configuration parameters indicating the TAG. 
     
     
         5 . The method of  claim 1 , wherein:
 the first TAG is identified by a first TAG identity; and   the second TAG is identified by a second TAG identity.   
     
     
         6 . The method of  claim 1 , wherein the RAR comprises a 12-bit field indicating the TAC. 
     
     
         7 . The method of  claim 1 , wherein transmitting the uplink signal is further based on a TCI state. 
     
     
         8 . The method of  claim 7 , wherein the TCI state is:
 the first TCI state in response to the TAG being the first TAG; and   the second TCI state in response to the TAG being the second TAG.   
     
     
         9 . The method of  claim 7 , wherein transmitting the uplink signal based on the TCI state further comprises transmitting the uplink signal with a transmit power that is determined based on the TCI state. 
     
     
         10 . The method of  claim 7 , wherein transmitting the uplink signal based on the TCI state further comprises transmitting the uplink signal with a spatial filter that is determined based on the TCI state. 
     
     
         11 . A wireless device comprising:
 one or more processors; and   memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
 transmit a random-access (RA) preamble for an RA procedure of a serving cell of:
 a first timing advance group (TAG) associated with a first transmission configuration indication (TCI) state; and 
 a second TAG associated with a second TCI state; 
 
 receive an RA response (RAR), corresponding to the RA preamble, wherein the RAR comprises:
 a timing advance command (TAC); and 
 a bitfield indicating a binary value; 
 wherein the RAR does not comprise a TAG index; 
 
   apply the TAC to a TAG that is:
 the first TAG in response to the binary value being set to a first value; and 
 the second TAG index in response to the binary value being set to a second value; and 
   transmit, via the serving cell, an uplink signal based on a TA value of the TAG.   
     
     
         12 . The wireless device of  claim 11 , wherein the instructions further cause the wireless device to receive one or more configuration parameters indicating one of the first TAG and the second TAG to apply the TAC. 
     
     
         13 . The wireless device of  claim 12 , wherein the one or more configuration parameters indicate:
 the first TAG being associated with the first TCI state; and   the second TAG being associated with the second TCI state.   
     
     
         14 . The wireless device of  claim 12 , wherein the applying is further based on the one or more configuration parameters indicating the TAG. 
     
     
         15 . The wireless device of  claim 11 , wherein:
 the first TAG is identified by a first TAG identity; and   the second TAG is identified by a second TAG identity.   
     
     
         16 . The wireless device of  claim 11 , wherein the RAR comprises a 12-bit field indicating the TAC. 
     
     
         17 . The wireless device of  claim 11 , wherein transmitting the uplink signal is further based on a TCI state. 
     
     
         18 . The wireless device of  claim 17 , wherein the TCI state is:
 the first TCI state in response to the TAG being the first TAG; and   the second TCI state in response to the TAG being the second TAG.   
     
     
         19 . The wireless device of  claim 17 , wherein transmitting the uplink signal based on the TCI state further comprises transmitting the uplink signal with a transmit power that is determined based on the TCI state. 
     
     
         20 . The wireless device of  claim 17 , wherein transmitting the uplink signal based on the TCI state further comprises transmitting the uplink signal with a spatial filter that is determined based on the TCI state.